Tube cleaning machine



FIG. 1 is a front elevation of a tube cleaning machine, showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and

FIG. 7 is a right side elevation of a modified embodiment of my new design having a greater top panel curvature and in all other respects identical to the embodiment of FIGS. 1-6;

FIG. 8 is a left side elevation view of the modified embodiment of FIG. 7.

FIG. 9 is a top view of the modified embodiment of FIG. 7; and,

FIG. 10 is a bottom view of the modified embodiment of FIG. 7. 

The ornamental design for a tube cleaning machine, substantially as shown and described. 